Radial drilling machine



Feb. 24, 1959 E. K. WlTZlG RADIAL DRILLING MACHINE Filed May 23, 1955invenivr Emil KWifZfa mam 5. 5mm

United States Patent 2,874,596 RADIAL DRILLING MACHINE Emil Karl Witzig,Reutlingen, Germany Application Ma 23, 1955, Serial No. 510,212 Claimspriority, application Germany February 3, 1949 Section 1, Public Law690, August 8, 1946 Patent expires February 3, 1969 8 Claims. (Cl. 77-28) and in which the flanges of the beam are eifectively protected fromdust and-dirt.

Another specific object of this invention is to provide a radialdrilling machine in which the drilling head can be brought close up tothe pillar so that the bending load on the beam is reduced to a minimum.This permits ofimproved accuracy in drilling, in particular where holesof large diameter are to be drilled.

A further specific object of the invention is to provide a radialdrilling machine in which the wear of the drilling tool is reduced asfar as possible.

Yet another specific object of the invention is to provide aradialdrilling machine with a play-free support of the beam and with arigid construction ofvthe housing.

With these and other objects in view which will appear as thedescription proceeds the invention consists. of certain novel featuresofconstruction as willbe particularly pointed out in the appended claims.

The manner of carrying the invention into effect is hereinafterdescribed by way of example, reference being had to the accompanyingdrawings in which:

' Fig! 1 is a side elevation of the radial drilling machine Fig. 2 ahalf-section through the'guidinghousing at right angles to the beamtaken on the'line 2-2 in Fig- In the base 1 of theradial"d'rilling"machine which carries the workutablejflis mountedytheivertical pillar 3.

On top of the pillar 3 is fixed the housing 4 in which the beamS isslidably guided in a lengthwise direction.

The beam 5 carreis the drilling head ,6 with the driving motor 7 and thelever 8'for advancing the tool.

t On the lower end of the vertical pillar 3 is arranged a. groovedcollar 9 in which engages the roller"11 .arranged at one end of a bellcrank 10. The other enact the bell crank is connectedbyalsuitabletransmission 12, .13 with a hand wheel 14 by means of which.the bell crank can be rocked and, therefore, the pillar,;3'moved upanddown. A helical spring 15 isidisposed 'coaxially with the pivotal axisof the bell crank 10, which spring is maintained tensioned by theprojection 16 on the upper arm of the bell crank 10 and'so counteractsthe weight of the vertical pillar 3, the housing 4 with the beam 5 thatonly relatively small forces have to be appliedto the hand wheel 14 tolift the pillar 3.

The beam 5 is of I-profile and consequently possesses great resistanceto bending and torsion stresses. The

inner surface of the upper flange 17 of the beam 5 runs on a roller 18,while the inner surface of the lower flange 19 is guided by a roller 20.

On each side of the web 21 of the beam 5 are provided two opposed andsimilar pairs of rollers 18, 20. Since the beam 5 is supported both atthe front and rear end of the housing 4 on such a roller guidance thereare, therefore, in all, four pairs of rollers 18, 20.

The rollers 18, are mounted, respectively, on a common axle 22. Thesmaller roller 20 is directly at tached to the axle 22 which runs inball bearings 23. Outside these bearings 23 rotates the sleeve 24 towhich is fixed the larger roller 18. The sleeve 24 rotates in its turnon ball bearings 25 in a bearing bush 26 which is fixed to a bearingsupport 27 on the housing 4.

The bearing surfaces of the rollers 18 and 20 and the beam 5 areinclined at a small angle, e. g. 15, to the horizontal. The symmetricalarrangement of the two pairs of rollers 18, 20 on both sides of the web21 of the beam 5 causes the bearing surfaces of the opposed pairs 7 ofrollers to be inclined .in opposite direction to the horizontal.

Internally screw threaded rings 28, 29 bear against the outer and innerend faces of the bearing support 27 with the aid of which rings thebearing bush 26, which has a corresponding external thread, and therebythe whole of the roller assembly can be adjusted in the axial direction.Consequently. the rollers 18 and 20 can be adjusted on both sidesagainst the ground bearing surfaces of the beam 5 in such a way that aperfect play-free and even in certain circumstances prestressed guidingof can be made at the maximum distance from the pillar 3 obtainable withthe beam 5.

At either or both ends of the beam two or more working spindles can beplaced close together either on its end face or on a longitudinal face,these serving for drilling, reaming or tapping, so that, for example, aseries of holes can be consecutively drilled, reamed and tapped in aheavy voluminous and not easily movable workpiece. It is convenient inthis case to arrange the drilling spindle centrally so that no twistingstresses are produced in the beam and its guiding means by the drillingpressure.

Heavy cumbersome workpieces which cannot be placed on the work tablebecause of their volume can be deposited at the side of the machineremote from the work table. By swinging the beam through work can bedone on the workpiece also at this side of the machine..

If there is arranged a drilling head at each end of the beam of themachine, it is possible to work with the drillinghead on the one side orwith that on the other side of the beam according to the position of thebores. The foregoing description. is directed solely towards theconstructions illustrated, but I desire it to be'understood that Ireserve the privilege of resorting to all mechanical changes to whichthe device is susceptible, the invention being defined and limited onlyby the terms of the appended claims.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is: 1. In a machine tool, in combination, avertical pillar;

a tool supporting beam mounted on said pillar for movement in directionnormal thereto, said supporting beam having a cross-section of an I-beamand the vertical plane of symmetry through the web of the I-beam locatedsubstantially in a plane through the axis of the pillar; and guide meansfor guiding said supporting beam in said direction of movement andincluding at each side of the web of said I-beam at least two pairs ofrollers and the rollers of each pair of said rollers engaging oppositeinner surfaces of flanges of said l-beam.

2. In a machine tool, in combination, a vertical pillar; a horizontaltool supporting beam mounted on said pillar for movement in directionnormal thereto, said supporting beam having a central vertical web andan upper and a lower flange forming together a substantially I-shapedcross-section and the vertical plane of symmetry through the web of theI-beam located substantially in a plane through the axis of the pillar;and guide means for guiding said supporting beam in said direction ofmovement and including at each side of said web at least two pairs ofrollers and the rollers of each pair of rollers engaging respectivelyinner surfaces of said upper and said lower flanges of said supportingbeam.

3. In a machine tool, in combination, a vertical pillar; a horizontaltool supporting beam mounted on said pillar for movement in directionnormal thereto, said supporting beam having a central vertical web andan upperand a lower flange forming together a substantially I-shapedcross-section and the vertical plane of symmetry through the web of thel-beam located substantially in a plane through the axis of the pillar;and guide means for guiding said supporting beam in said direction ofmovement and including at each side of said web at least two pairs ofrollers and the rollers of each pair of rollers engaging respectivelyinner surfaces of said upper and said lower flanges of said supportingbeam, said upper and, said lower flanges having respectively oppositelyinclined inner surfaces including an angle up to about 30 to ahorizontal surface.

4. In a machine tool, in combination, a horizontal tool supporting beamreciprocable in longitudinal direction thereof, said supporting beamhaving a central vertical web and an upper and a lower flange formingtogether a substantially Lshaped cross-section; and guide means forguiding said supporting beam in said direction of movement and includingat each side of said web at least two pairs of rollers and the rollersof each pair of rollers engaging respectively inner surfaces of saidupper and said lower flanges of said supporting beam and being arrangedfor rotation about a common axis, said upper and said lower flangeshaving respectively oppositely inclined inner surfaces including anangle up to about 30 to a horizontal surface. v

5. in a machine tool, in combination, a horizontal tool supporting beamreciprocable in longitudinal. direction thereof, said supporting beamhaving a central vertical web and an upper and a lower flange formingtogether a substantially I-shaped cross-section; guide means for guidingsaid supporting beam in said direction of movement and including at eachside of said web at least two pairs of rollers and the rollers of eachpair of rollers engaging respectively inner surfaces of said upper andsaid lower flanges of said supporting beam and being arranged forrotation about a common axis, said upper and said lower flanges havingrespectively oppositely inclined inner surfaces including an angle up to30 to a horizontal surface; and adjusting means. for adjusting theposition of each of said pair of rollers in the direction of the axisthereof. r

6. In a machine tool, in combination, a horizontal tool supporting beamreciprocable in longitudinal direction thereof, said supporting beamhaving a central vertical web, an upper flange and a lower flangeforming together a substantially I-shaped cross-section, said upper andsaid lower flange having respectively oppositely inclined inner surfacesincluding an angle up to about 30 to a horizontal surface; and guidemeans for guiding said supporting beam in said direction of movement andincluding at least two pairs of rollers arranged at each side of saidweb, the rollers of each pair of said rollers engaging respectively saidinner surfaces of said upper and said lower flanges of said supportingbeam and one of the rollers in each pair of said rollers having adiameter larger than the diameter of the other roller of said pair ofrollers and, being mounted for rotation about its axis on asleevecoaxial with the axis of said othervroller.

7. In a machine tool, in combination, a horizontal tool supporting beamreciprocable in longitudinal direction thereof, said. supporting beamhaving a central vertical web, an upper flange and a lower flangeforming together a substantially l-shaped cross-section, said upper andsaid lower flanges having respectively oppositely inclined innersurfaces including an angle up to about 30 to a horiz ontal surface; andguide means for guiding said supporting beam in said direction ofmovement and including at least two pairs of rollers arranged at eachside of said Web, the rollers of each pair of said rollers engagingrespectively said inner surfaces of said upper and said lower flanges ofsaid supporting beam and one of the rollers in each pair of said rollershaving a diameter larger than the diameter of the other roller of saidpair of rollers and being mounted for rotation about its axis on asleeve coaxial with the axis of said other roller, and bearing means forsaid other roller mounted in said sleeve.

8. In a machine tool, in combination, a horizontal tool supporting beamreciprocable in longitudinal direction thereof, said supporting beamhaving a central vertical web and a lower flange and an upper flangeextending laterally from said central web farther than said lower flangeand forming together with said central web a substantially I-shapedcross-section; and guide means for guiding said supporting beam in saiddirection of movement and including at each side of said web at leasttwo pairs of rollers andthe rollers of each pair of rollers engagingrespectively inner surfaces of said upper and said lower flanges of saidsupporting beam and being arranged for rotation about a common axis,said upper and said lower flanges having respectively oppositelyinclined inner surfaces including an angle up to about 30 to ahorizontal surface.

References; Cited in the file of this patent UNITED STATES PATENTS

